ohthoceratidj:. 
65 
commonly found in Sweden.’’ The ribs,” he continues, “ are 
very seldom so much oblique in my numerous specimens, nor are 
the striae of the shell so closely set as in bis [Barrande's] specimens.” 
Dr. Lindstrbm adds : “ 0. Gotlandicum, Boll, is only the chambered 
portion of 0. Hisiageri” (Fig. 6.) 
In this opinion I fully concur with him, and I have therefore 
included the former species in the list of synonymy above. 
Horizon. Upper Ludlow. 
Locality. Island of Gothland, Sweden. 
Fairly weB represented in the Collection. 
Fig. 5. Fig. 6. 
r. 
Fig. 5. Orthoceras ornatum. — a, specimen with some of the test adherent ; 
h, section witli siphuncle ; c, portion of the test enlarged. 
Fig. 6. Orthoceras His'mgeri. — a, cast of the septate portion of the shell ; 
h, section with siphuncle; both of the natural size; c, portion of the 
test, magnified h 
From a drawing obligingly sent to me by Dr. Lindstrbm. 
